Three-dimensional reconstruction based on  micro-imaging under wavelength-tunable illumination

Area of Science:

• Optics and Imaging
• 3D Reconstruction Technologies

Background:

• Three-dimensional reconstruction is vital across many scientific fields.
• Traditional methods often rely on sample or lens movement for imaging.
• Micro-imaging offers potential for advanced reconstruction techniques.

Purpose of the Study:

• To develop a novel 3D reconstruction technique using micro-imaging.
• To leverage "shape from focus" and chromatic aberration effects.
• To eliminate the need for mechanical movement in achieving focus.

Main Methods:

• Utilized "shape from focus" and chromatic aberration for 3D reconstruction.
• Employed tunable illuminance to adjust imaging distance.
• Constructed a verification system with adjustable illuminance (500-750 nm) and 10× magnification.

Main Results:

• Achieved high precision reconstruction in the micrometer range.
• Identified depth of field as a challenge during reconstruction.
• Demonstrated a low reconstruction bias of 0.01 mm using a coin as a test object.

Conclusions:

• The proposed micro-imaging method is practical for surface reconstruction.
• Optical design improvements can further enhance the capabilities of this technique.
• This approach offers an alternative to conventional movement-dependent reconstruction methods.